When both addons are used together, Gatherer's "Show/Hide Items" button partially
obscures MozzFullWorldMap's "Show Unexplored Areas" checkbox. The following code
modification should resolve this specific issue when using Gatherer and
MozzFullWorldMap together by anchoring MozzFullWorldMap's "Show Unexplored Areas"
checkbox to Gatherer's "Show/Hide Items" button, if it exists.

Open the MozzFullWorldMap.lua file, found at:
(WindowsXP default location)
C:\Program Files\World of Warcraft\Interface\AddOns\MozzFullWorldMap\MozzFullWorldMap.lua

Replace function Mozz_AnchorMapOptions() with the following function code.
(Lines starting at 704 through 712.)